Apparatus for longitudinally cutting moving webs of material, such as paper, cardboard and the like and including means to remove the cutting dust



June 18, 1968 BAUCKE 3,388,624

APPARATUS FOR LONGITUDINALLY OUTTING MOvING WEBS OF MATERIAL, SUCH As PAPER, CARDBOARD AND THE LIKE AND INCLUDING MEANs To REMOVE THE CUTTING DUsT Filed June 27, 1966 2 Sheets-Sheet 1 Fig. 7

June 18, 1968 BAUCKE 3,388,624

APPARATUS FOR LONGITUDINALLY CUTTING MOVING WEBS OF MATERIAL, SUCH AS PAPER, CARDBOARD AND THE LIKE AND INCLUDING MEANS TO REMOVE THE CUTTING DUST Filed June 27, 1966 2 Sheets-Sheet 2 Fig.3

.4 Fig 4 Unite Claims. ci. 83168) The present invention relates to an apparatus for the l0ngitudinal cutting of moving webs of material such as paper, cardboard and the like.

More particularly, the invention relates to a cutting apparatus including upper and lower knives and in which such knives are interconnected by a yoke-like member capable of being adjusted transversely with respect to the direction of movement of the web of material.

Generally, the longitudinal cutting of moving paper webs especially in roll cutting machines or other machines processing moving webs, is accomplished with the assistance of longitudinal cutting units constituted by one or more pairs of circular knives located transversely respecting the direction of movement of the web to be cut. To shorten the time element required for mounting, adjusting and dismounting the cutting unit, it has been found etlicacious to mount the upper and lower knives on a common yoke which is positioned adjustably relative to a support extending transversely to the direction of movement of the web. The arrangement is such that the common yoke is located behind the cutting zone and extends through the gap effected by the cutting operation of the knives, preferably at an acute angle relative to the web, in such a fashion that while avoiding a substantial deformation of the cut edges of the web one edge is deflected slightly upwardly while the other is deflected slightly downwardly.

As is well known, the longitudinal cutting of paper webs presents a special problem, namely, the formation of dust which necessitates steps being taken to avoid atmospheric pollution and a deposit of dust on the machine. While suction devices are known, such suction devices in addition to being expensive, consume considerable space and are additionally efiective only to a limited degree since a relatively large proportion of particles of dust adheres to the cut or separated edges of the web and is moved along by such edges without being subjected to the suction eifect.

The above-mentioned difficulties are overcome by the present invention in that the yoke-like member which extends through the gap of the web and which supports the upper and lower circular knives is defined by a hollow body provided with suction openings or apertures. The yoke-like member extends through the gap at an acute angle with respect to the web and is provided with one or more suction openings or apertures for each of the cut or separated edges of the web and which edges are positioned in different planes. More specifically, the arrangement is such that in the zone of the separated edges both sides of the yoke-like member, and which member is located directly behind the zone of cutting, are provided with a row or series of openings or apertures extending axially thereof.

By virtue of the present invention there is provided an arrangement which eliminates the space consuming suction devices and which devices also impair access to the cutting unit and the dust is subjected directly to the suction effect in the zone or area where the dust originates. For that purpose the yoke-like member which separates the cut edges of the web functions as a suction means States Patent 0 3,388,624 Patented June 18, 1968 and the fact that the cut edges are displaced away from each other in the area of the yoke-like member and thereafter move in different planes it is possible to guide the edges through the efiective zone of the suction openings or apertures which are separated from each other axially of the yoke-like member.

Further objects and advantages of the present invention will become more readily apparent from the following detailed description and annexed drawings, and in which drawings:

FIGURE 1 is a view in side elevation, partly broken away and partly in cross-section, of the longitudinal cutting apparatus embodying the present invention,

FIGURE 2 is a top plan view of the apparatus shown in FIGURE 1,

FIGURE 3 is a front elevational view of the apparatus shown in FIGURE 1,

FIGURE 4 is a view taken along the lines 44 of FIGURE 2, the view looking in the direction of the arrows and being on a somewhat larger scale, and

FIGURE 5 is a view taken along the line 55 of FIGURE 2, the view looking in the direction of the arrows and being on a somewhat larger scale.

As perhaps best illustrated in FIGURES 1 and 3, the longitudinal cutting apparatus includes upper and lower circular knives 1 and 2, respectively, and between which knives a paper web 3 to be cut is moved by suitable and convenient means. The knives 1 and 2 are provided with bearings 4 and 5, respectively, which are interconnected by means of a bridge-like yoke 6 which, as clearly shown in FIGURES 1 and 4, passes through gap 7 of the web 3 directly behind the circular knives 1 and 2 viewed in the direction of movement of the web. In FIGURE 3 it will be noted that the bearing 5 of the lower knife 2 is provided with an extension 9 in the nature of a sleeve which encircles a support 8 which extends transversely with respect to the web 3. The extension 9, which can be afiixed to and detached from the support 8 by known means, permits the axial shifting of the yoke and knives 1 and 2 relative to the web. Manifestly, when the knives have been adjusted to the desired position respecting the web 3 the extension 9 is afiixed to the support to maintain the knives in such adjusted position.

Referring to FIGURES 3 and 5, it will be noted that the bridge-like yoke 6 enters or extends through the gap 7 at an acute angle thereby resulting in only a slight deflection of the cut edge areas of the web 3, as clearly illustrated in FIGURE 5. As is readily apparent from FIGURES 4 and 5, in the area where the yoke 6 extends through the web 3, the yoke is defined as a hollow body 10 which is adapted to be connected by a conduit 11 with a source of suction of any convenient type (not illustrated). The hollow body 10 is preferably wedge-shaped in cross section and is provided on its opposite sides with suction openings 12. The suction openings 12 are disposed in series behind one another viewed in the direction of movement of the paper web 3 (FIGURE 4). By virtue of this arrangement there is provided for each of the cut edges which are separated by the yoke 6 a series of openings whose suction effect can act directly on the cut edges which are freely disposed in this particular zone and can at the same time draw the dust particles into the hollow body and through the conduit 11.

This invention is not to be confined to any strict conformity to the showings in the drawings but changes or modifications may be made therein so long as such changes or modifications mark no material departure from the spirit and scope of the appended claims.

What is claimed is:

1. An apparatus for longitudinally cutting moving webs of material such as paper, cardboard and the like, comprising upper and lower knives between which knives the web is adapted to move, a yoke interconnecting said upper and lower knives extending through the gap formed in the web by the knives, and said yoke being constituted by a hollow body having suction openings therein so that when suction is applied to the hollow body any dust developed during cutting is drawn into the body through the suction openings.

2. The apparatus for longitudinally cutting moving webs of material as claimed in claim 1 in which said yoke extends through the gap at an acute angle relative to the plane of movement of the web for displacing the cut edges of the web in different planes, with said suction openings being arranged for cooperation with each cut edge.

3. The apparatus for longitudinally cutting moving webs of material as claimed in claim 2 in which said suction openings are arranged in series axially of said hollow body.

4. The apparatus for longitudinally cutting moving webs of material as claimed in claim 3 in which said yoke extends through the gap directly behind the upper and lower knives viewed in the direction of movement of the web.

5. The apparatus for longitudinally cutting moving webs of material as claimed in claim 4 including means for mounting said upper and lower knives and yoke for movement transversely with respect to the paper web and means for securing said knives and yoke in the desired position relative to the web.

References Cited UNITED STATES PATENTS 3,135,151 6/1964 Link et a1. 83-468 FOREIGN PATENTS 373,244 4/1923 Germany.

ANDREW R. JUHASZ, Primary Examiner. 

1. AN APPARATUS FOR LONGITUDINALLY CUTTING MOVING WEBS OF MATERIAL SUCH AS PAPER, CARDBOARD AND THE LIKE, COMPRISING UPPER AND LOWER KNIVES BETWEEN WHICH KNIVES THE WEB IS ADAPTED TO MOVE, A YOKE INTERCONNECTING SAID UPPER AND LOWER KNIVES EXTENDING THROUGH THE GAP FORMED IN THE WEB BY THE KNIVES, AND SAID YOKE BEING CONSTITUTED BY A HOLLOW BODY HAVING SUCTION OPENINGS THEREIN SO THAT WHEN SUCTION IS APPLIED TO THE HOLLOW BODY ANY DUST DEVELOPED DURING CUTTING IS DRAWN INTO THE BODY THROUGH THE SUCTION OPENINGS. 